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chkwong

macrumors member
Original poster
Jan 17, 2020
94
29
seem sclean install Big Sur through Internet Recovery by Option-Command-R still not work now for Mac mini 2018
 

m0dest

macrumors newbie
Apr 16, 2010
27
35
If you're looking to do a true clean install of Big Sur right now, you're going to want to create a bootable Big Sur installer on a USB drive.


Make sure to read the instructions about temporarily disabling the secure boot settings, though, as your 2018 Mac mini has a T2 security chip.

This will let you fully erase the internal hard drive before installing Big Sur.
 

chkwong

macrumors member
Original poster
Jan 17, 2020
94
29
Thanks for reply
It requires update boot rom version in Mac mini 2018 through update from Catalina first, then internet recovery could go into big sur internet recovery now.
 

Kylo83

macrumors 68030
Apr 2, 2020
2,876
9,181
Can I ask whats the best way to clean install without the Mac installing the macOS it came with whats the difference with option command r or shift option command r what one is better for a clean install after format but I want to install the latest version not the one the Mac came with
 

chkwong

macrumors member
Original poster
Jan 17, 2020
94
29
Can I ask whats the best way to clean install without the Mac installing the macOS it came with whats the difference with option command r or shift option command r what one is better for a clean install after format but I want to install the latest version not the one the Mac came with
option command r : install latest macOS compatible with your Mac, but may require boot rom update first

shift option command r: install macOS that ship with your Mac
 

Kylo83

macrumors 68030
Apr 2, 2020
2,876
9,181
option command r : install latest macOS compatible with your Mac, but may require boot rom update first

shift option command r: install macOS that ship with your Mac
I have the 16" 2019 MacBook Pro whats the boot rom if I delete the partition and use option command r to get the latest version would it install or would I have problems, I dont wanna install Catalina first
 

chkwong

macrumors member
Original poster
Jan 17, 2020
94
29
I have the 16" 2019 MacBook Pro whats the boot rom if I delete the partition and use option command r to get the latest version would it install or would I have problems, I dont wanna install Catalina first
you could create bootable USB installer...
then boot from usb, will see "a software update is required to use this startup disk" which will update the boot rom
then use option command r to go into Big Sur internet recovery mode
 

Kylo83

macrumors 68030
Apr 2, 2020
2,876
9,181
last time I done that I had major issues because the t2 chip and didnt wanna mess with turning things off
 

chkwong

macrumors member
Original poster
Jan 17, 2020
94
29
last time I done that I had major issues because the t2 chip and didnt wanna mess with turning things off
then install Catalina first, then update Big Sur from Catalina, then internet recovery to clean install again
 

AMP12345

macrumors member
Nov 21, 2016
79
94
CMD + Opt + R internet recovery just worked for me to do a clean instal of Big Sur on a 16” MBP. I had been on the betas previously.
 

chkwong

macrumors member
Original poster
Jan 17, 2020
94
29
CMD + Opt + R internet recovery just worked for me to do a clean instal of Big Sur on a 16” MBP. I had been on the betas previously.
Your previous betas may have updated your boot rom, so CMD + OPT + R works for you
 
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whitepowderma

macrumors newbie
Nov 18, 2020
12
2
I created a USB bootable drive and did a clean install of Big Sur. It just erased the system volume and not the data/app volume. I did have to update the boot rom. I had some problems with the install and have some file issues. I would now like to do a complete clean install (erase both system and app/data volumes) via Internet Recovery. Since I already have Big Sur installed can I just use CMD + R? Will it erase both volumes before the install?
 

chkwong

macrumors member
Original poster
Jan 17, 2020
94
29
I created a USB bootable drive and did a clean install of Big Sur. It just erased the system volume and not the data/app volume. I did have to update the boot rom. I had some problems with the install and have some file issues. I would now like to do a complete clean install (erase both system and app/data volumes) via Internet Recovery. Since I already have Big Sur installed can I just use CMD + R? Will it erase both volumes before the install?
CMD+R should be fine since Big Sur installed

go to disk utility, erase volume group
then clean install
 

neojapsz

macrumors newbie
May 31, 2019
3
0
I've just got a 2020 iMac 27inch which is my first Mac and apple device. Its come with Catalina, I don't see much point in trying to get used to that with Big Sur out. I may as well go straight to that, I know with windows I always liked to do a clean install, but with Macs I've no idea were to start. What is the easiest way for me to just do a clean install, I don't need to save anything, and do I type commands into a terminal or do I boot into a different mode, I'm very much on a steep learning curve :)
 

Apple_Robert

macrumors Nehalem
Sep 21, 2012
30,704
40,911
In the middle of several books.
I've just got a 2020 iMac 27inch which is my first Mac and apple device. Its come with Catalina, I don't see much point in trying to get used to that with Big Sur out. I may as well go straight to that, I know with windows I always liked to do a clean install, but with Macs I've no idea were to start. What is the easiest way for me to just do a clean install, I don't need to save anything, and do I type commands into a terminal or do I boot into a different mode, I'm very much on a steep learning curve :)
If you just got the machine, there really is no reason to do a clean install. MacOS is not fragmented like Windows. I recommend just doing the update to Big Sur.
 

robotica

macrumors 65816
Jul 10, 2007
1,161
1,256
Edinburgh
@neojapsz personally I think it would be good to learn how to create a bootable usb installer and install it from scratch. If this is your first Mac you will learn a lot and it’s quite fun. If you want an easy life you can just do the upgrade.
 
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